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Start Over Collections Medicine in the Americas, 1610-1920 ✖Remove constraint Collections: Medicine in the Americas, 1610-1920 Subjects Refractive Errors -- diagnosis ✖Remove constraint Subjects: Refractive Errors -- diagnosis Titles An additional test for the diagnosis of ametropia, with a method to determine its various degrees ✖Remove constraint Titles: An additional test for the diagnosis of ametropia, with a method to determine its various degrees

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